\begin{table}[htbp]\centering
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\caption{Study 3 Summary Statistics \label{partisancanvassdemos}}
\begin{tabular}{l*{1}{cc}}
\hline\hline
                    &\multicolumn{2}{c}{}     \\
                    &        mean&          sd\\
\hline
Age                 &       31.60&       13.55\\
Male                &        0.44&        0.50\\
Female              &        0.48&        0.50\\
White               &        0.75&        0.44\\
African American    &        0.15&        0.36\\
College Grad        &        0.68&        0.47\\
Democrat            &        0.60&        0.49\\
Independent or Other&        0.40&        0.49\\
Republican          &        0.00&        0.00\\
Very Liberal        &        0.74&        0.44\\
Liberal             &        0.21&        0.41\\
Moderate            &        0.05&        0.21\\
Prior Campaign Experience&        0.65&        0.48\\
Prior Perspective-Getting Experience&        0.17&        0.38\\
\hline
Observations        &         104&            \\
\hline\hline
\end{tabular}
\end{table}
